Sublime itself is designed to be cross platform, and I do intend to release a Linux version. However, I'm not planning on doing it in the near future: In general, I'd rather have less features and more polish, so it's going to be some time before Linux support is the right thing to do next.

Sublime Text itself is a C++ core with Python plugins, however the vast majority of the code is C++ at this point in time. My hope is to see this change and for as much new functionality as possible to be done entirely in Python.